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<b>DB_ENV-&gt;cdsgroup_begin</b>
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<b><pre>
#include &lt;db.h&gt;
<p>
int
DB_ENV-&gt;cdsgroup_begin(DB_ENV *dbenv, DB_TXN **tid);
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<b>Description: DB_ENV-&gt;cdsgroup_begin</b>
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<p>The DB_ENV-&gt;cdsgroup_begin method allocates a locker ID in an
environment configured for Berkeley DB Concurrent Data Store applications.  It copies a pointer to
a <a href="../api_c/txn_class.html">DB_TXN</a> that uniquely identifies the locker ID into the memory
to which <b>tid</b> refers.  Calling the <a href="../api_c/txn_commit.html">DB_TXN-&gt;commit</a> method will
discard the allocated locker ID.</p>
<p>See <a href="../ref/cam/intro.html">Berkeley DB Concurrent Data Store applications</a> for more
information about when this is required.</p>
<p>The DB_ENV-&gt;cdsgroup_begin method may be called at any time during the life of the
application.</p>
<p>The DB_ENV-&gt;cdsgroup_begin method
returns a non-zero error value on failure
and 0 on success.
</p>
<br><b>Errors</b>
<p>The DB_ENV-&gt;cdsgroup_begin method
may fail and return one of the following non-zero errors:</p>
<br>
<b>ENOMEM</b><ul compact><li>The maximum number of lockers has been reached.</ul>
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<br><b>Class</b>
<a href="../api_c/env_class.html">DB_ENV</a>, <a href="../api_c/txn_class.html">DB_TXN</a>
<br><b>See Also</b>
<a href="../api_c/txn_list.html">Transaction Subsystem and Related Methods</a>
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